let a = {
    age: 11,
    b: {
        name: "zhangsan",
        fn() {
            let that = this;
            console.log(this.name);
            console.log(that.name);
            console.log(a.age)
            function c() {
                console.log(this);
                console.log(that);
            }

            return c;
        }
    }
};
// a.b.fn();
let b = a.b.fn();
b();
// console.log("----------------------------------")
// a.b.fn()();